Patent GB-489726-A (GB)
Title: A new or improved stereotype plate casting machine
IPC: B41D3/00
Filed: 1937-02-03
Abstract: 489,726. Casting stereotype. HOE & CO., Ltd., R. (Hoe & Co., Inc., R.) Feb. .3, 1937, No. 3241. [Class 100 (ii)] In a machine for casting part-cylindrical stereotype plates, the molten metal is delivered from a reservoir to a horizontal mould at its lowest point intermediate the side edges so that it flows upwardly and so avoids trapping any air. The reservoir 3 is mounted on frame members 1 by means of springs and bolts 5 to permit of expansion, and electric or other heating-elements 8 may be provided in the reservoir. The bottom of the reservoir is formed as a V-shaped discharge nozzle 6 over which is mounted a plate 16 having openings adapted to be closed by valves preferably in the form of a sliding apertured bar 18 connected to a piston 26 movable in a cylinder 25 to which pressure fluid is supplied through a port 27. Air displaced by the metal is expelled through openings 15. The nozzle 6 is arranged near the centre of the mould core 12 which is supported by springs and bolts 24 from a flange on the reservoir, the pressure of the springs being adjustable to ensure correct pressure of the mould against the reservoir. The nozzle may be heated by elements 111, 112 insulated from the core by packing 113. The cylinder 25 is mounted on the core in such a way as to participate in the movements due to expansion. The back 9 co-operating with the core 12 carries matrix clips at each side edge formed of pairs of jaws 41, 42 held together in sliding engagement by screws, and pressed to grip the matrix M by a spring 47 ; a screw 109 enables the jaws to be opened to release the matrix. The lower jaw member is pivoted on a shaft 44 and the pair of jaws is spring-pressed into closed position ; springs 100 on the core may also be provided to assist this action. The end gauges 86 are carried by the core, and are connected to a slide 90 at each end of the mould, the slides being movable by means of rock-shafts 94 controlled by springs 96 and pistons 97 in hydraulic cylinders, the pistons being operated automatically to withdraw the gauges when the mould is opened. The back is carried by arms 54 secured to a rock-shaft 56 provided with a gear-segment meshing with a rack on a bar sliding under the influence of pressure in cylinders 61, 62, secured to the frame. When the mould is opened, the back, carrying with it the plate and matrix, passes between a pair of levers 63 secured to a rock-shaft 65. Each lever carries a clip 78 adapted to engage the bevelled edge of a plate, the clip being normally withdrawn by a spring and adapted to be pressed hydraulically into engaging position. When the plate is gripped, the levers 63 are rocked by a rack 104 movable in a hydraulic cylinder 107. The matrix clips are rocked to permit passage of the plate and to strip the matrix by means of cams 66, 67 on the levers 63 which engage rollers 68 on arms 70 connected by gearing to the jaw members 41. When the levers have been rocked, the clips 78 are withdrawn to deposit the plate on a runway 102. The various hydraulic mechanisms are operated automatically in timed relation by cams on a motor-driven shaft.